OK so I have narrowed this down to the amq:broker element behaves badly in
spring or in spring within JBoss.  I changed my broker name to localhost2. 
Spring or JBoss appears to be registering this mbean twice.  Anybody have
any ideas on how to fix this? 

    <amq:broker start="true" brokerName="localhost2" persistent="false"
useJmx="true">
        <amq:managementContext>
            <amq:managementContext createConnector="false" />
        </amq:managementContext>
    </amq:broker>

    <!-- JMS ConnectionFactory to use, configuring the embedded broker using
XML -->
    <amq:connectionFactory id="jmsFactory" brokerURL="vm://localhost">
    </amq:connectionFactory>

and the result...

Caused by: javax.management.InstanceAlreadyExistsException:
org.apache.activemq:BrokerName=localhost2,Type=Broker already registered.
        at
org.jboss.mx.server.registry.BasicMBeanRegistry.add(BasicMBeanRegistry.java:761)
        at
org.jboss.mx.server.registry.BasicMBeanRegistry.registerMBean(BasicMBeanRegistry.java:225)
        at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
        at
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
        at
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
        at
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
        at
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
        at
org.jboss.mx.server.MBeanServerImpl$3.run(MBeanServerImpl.java:1422)
        at java.security.AccessController.doPrivileged(Native Method)
        at
org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:1417)
        at
org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:376)
        at
org.jboss.system.server.jmx.LazyMBeanServer.registerMBean(LazyMBeanServer.java:215)
        at
org.apache.activemq.broker.BrokerService.createBroker(BrokerService.java:1554)
        at
org.apache.activemq.broker.BrokerService.getBroker(BrokerService.java:540)
        at
org.apache.activemq.broker.BrokerService.start(BrokerService.java:444)
        at
org.apache.activemq.xbean.XBeanBrokerService.afterPropertiesSet(XBeanBrokerService.java:50)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1368)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1334)
        ... 106 more

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